# numpy.dstack¶

numpy.dstack(tup)[source]

Stack arrays in sequence depth wise (along third axis).

This is equivalent to concatenation along the third axis after 2-D arrays of shape (M,N) have been reshaped to (M,N,1) and 1-D arrays of shape (N,) have been reshaped to (1,N,1). Rebuilds arrays divided by `dsplit`.

This function makes most sense for arrays with up to 3 dimensions. For instance, for pixel-data with a height (first axis), width (second axis), and r/g/b channels (third axis). The functions `concatenate`, `stack` and `block` provide more general stacking and concatenation operations.

Parameters
tupsequence of arrays

The arrays must have the same shape along all but the third axis. 1-D or 2-D arrays must have the same shape.

Returns
stackedndarray

The array formed by stacking the given arrays, will be at least 3-D.

See also

`concatenate`

Join a sequence of arrays along an existing axis.

`stack`

Join a sequence of arrays along a new axis.

`block`

Assemble an nd-array from nested lists of blocks.

`vstack`

Stack arrays in sequence vertically (row wise).

`hstack`

Stack arrays in sequence horizontally (column wise).

`column_stack`

Stack 1-D arrays as columns into a 2-D array.

`dsplit`

Split array along third axis.

Examples

```>>> a = np.array((1,2,3))
>>> b = np.array((2,3,4))
>>> np.dstack((a,b))
array([[[1, 2],
[2, 3],
[3, 4]]])
```
```>>> a = np.array([,,])
>>> b = np.array([,,])
>>> np.dstack((a,b))
array([[[1, 2]],
[[2, 3]],
[[3, 4]]])
```